写一个轮播图的代码

以下是一个简单的轮播图代码，使用了HTML、CSS和JavaScript：

HTML代码：

<div class="slideshow-container">
  <div class="mySlides fade">
    <img src="image1.jpg">
  </div>

  <div class="mySlides fade">
    <img src="image2.jpg">
  </div>

  <div class="mySlides fade">
    <img src="image3.jpg">
  </div>

  <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1)">&#10095;</a>
</div>

CSS代码：

.slideshow-container {
  position: relative;
  width: 100%;
  height: 500px;
}

.mySlides {
  display: none;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.prev, .next {
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  cursor: pointer;
  z-index: 1;
}

.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1s;
  animation-name: fade;
  animation-duration: 1s;
}

@-webkit-keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

JavaScript代码：

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  if (n > slides.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";  
  }
  slides[slideIndex-1].style.display = "block";  
}

该代码使用了CSS动画，将轮播图的图片淡入淡出，同时添加了左右箭头，可以通过点击箭头来切换轮播图片。